bug#11080: 24.0.94; Assertion failure in signal handler

["Johan Bockgård" <bojohan@gnu.org>]

emacs -Q

;; "foo" is any non-existing or non-xbm file.
;; Eval:
(face-remap-add-relative 'default '(:stipple "foo"))

C-h k x

Move the mouse pointer over one of the links in the lower window.

   =>

eval.c:3403: Emacs fatal error: assertion failed: !handling_signal


(gdb) bt
#0  abort () at emacs.c:394
#1  0x00000000006cc497 in die (
    msg=0x8c6240 "assertion failed: !handling_signal", 
    file=0x8c45a0 "eval.c", line=3403) at alloc.c:6339
#2  0x00000000006f85ea in record_unwind_protect (
    function=0x51738c <code_conversion_restore>, arg=17433222) at eval.c:3403
#3  0x000000000051750d in code_conversion_save (with_work_buf=0, multibyte=0)
    at coding.c:7587
#4  0x000000000051938d in encode_coding_object (coding=0x7fffffffb880, 
    src_object=16002785, from=0, from_byte=0, to=10, to_byte=10, 
    dst_object=15632946) at coding.c:7939
#5  0x000000000051f627 in code_convert_string (string=16002785, 
    coding_system=16884370, dst_object=15632946, encodep=1, nocopy=0, 
    norecord=1) at coding.c:9047
#6  0x000000000051f76e in code_convert_string_norecord (string=16002785, 
    coding_system=16884370, encodep=1) at coding.c:9069
#7  0x000000000073ca71 in openp (path=15880502, str=17252417, 
    suffixes=15632898, storeptr=0x7fffffffbdf8, predicate=15632898)
    at lread.c:1558
#8  0x00000000005b74ce in x_create_bitmap_from_file (f=0x12aff30, 
    file=17252417) at image.c:352
#9  0x000000000055a222 in load_pixmap (f=0x12aff30, name=17252417, 
    w_ptr=0x1a211b4, h_ptr=0x1a211b8) at xfaces.c:995
#10 0x0000000000569408 in realize_x_face (cache=0x1322e40, 
    attrs=0x7fffffffc140) at xfaces.c:5754
#11 0x00000000005687e4 in realize_face (cache=0x1322e40, 
    attrs=0x7fffffffc140, former_face_id=-1) at xfaces.c:5501
#12 0x0000000000565672 in lookup_face (f=0x12aff30, attr=0x7fffffffc140)
    at xfaces.c:4501
#13 0x000000000056a08a in face_at_buffer_position (w=0x17de890, pos=91, 
    region_beg=0, region_end=0, endptr=0x7fffffffc2b8, limit=92, mouse=1, 
    base_face_id=-1) at xfaces.c:6065
#14 0x00000000004a5592 in mouse_face_from_buffer_pos (window=25028757, 
    hlinfo=0x11370a8, mouse_charpos=91, start_charpos=87, end_charpos=100, 
    before_string=15632898, after_string=15632898, disp_string=15632898)
    at xdisp.c:26341
#15 0x00000000004a934e in note_mouse_highlight (f=0x12aff30, x=274, y=41)
    at xdisp.c:27375
#16 0x0000000000577b10 in note_mouse_movement (frame=0x12aff30, 
    event=0x7fffffffcc90) at xterm.c:3843
#17 0x000000000057d6b9 in handle_one_xevent (dpyinfo=0x1137000, 
    eventptr=0x7fffffffcf80, finish=0xe6a57c, hold_quit=0x7fffffffd210)
    at xterm.c:6779